The Brazilian supermodel pulled out all the stops to mark the day and hired out a venue, which was completely decorated with colourful balloons.

Once inside, a delicious candy bar, a circus-themed birthday cake and white and orange cupcakes were available for all the guests.

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For the event, Alessandra, 32, colour coordinated with the party decoration and wore a showstopping bright red maxi gown with a vibrant scarf style pattern.

She teamed her halterneck dress with a thick black belt and a pair of flat sandals.

Also at the party were Alessandra's fiancé Jamie Mazur and their eldest child, Anja, 4.

The stunning brunette posted a picture of her with her family at the party accompanied by the caption: "My baby 1st birthday party!! #familylove best thing in the world".

In another cute snap, she is pictured with her fiancé and birthday boy Noah, who is holding up a big red and white lollipop.

"The most delicious thing in the whole world!!! #love #family #NoahPhoenix," she wrote.

The mum-of-two first showed off her son Noah in the Latin American publication, Caras.

Sharing a preview of the intimate photoshoot on Facebook, the 32-year-old beauty wrote "wanted to give you all a sneak peek of Noah".

In the touching images the proud mum was seen planting a tender kiss on her son's head. They also featured big sister Anja, who looked thrilled with her new playmate.

Alessandra's daughter Anja has already followed in her mum's footsteps after making her modelling debut in November last year. The four-year-old posed alongside mum Alessandra in a campaign for London Fog.

Talking about their time on set, Alessandra revealed that Anja thoroughly enjoyed the experience. "Anja had a lot of fun, she loved all of her outfits," adding, "she was really into the polka dot trench coat."

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